Rei Ametani's life is nothing but mundane; he's just waiting for death to take him. Despite being a gifted trumpeter in his youth, he struggles to stay awake during classes. However, everything changes when he finds a note in his shoe locker claiming to be a declaration of love. Intrigued, he agrees to meet the sender, but it's not a love confession. Instead, Sora Kamizono approaches him with a request to help destroy the world. Kamizono, one of the Seven Angels mentioned in the Book of Revelation, is on a mission from God to bring about the end of the Earth using her trumpet-playing skills. The only problem is she's not very good and needs Ametani's help. Despite his eagerness for death, he agrees to mentor Kamizono for the next seven days. As the past and present start to mingle, both Ametani and Kamizono start to doubt their mission.
Although he works at an arcade, "Mobuo" remains inconspicuous among his co-workers, earning a nickname that implies his ability to seamlessly blend into his environment like an NPC. But, when the colorful and stunning Nanora Yaegashi visits the arcade seeking his help in mastering the most challenging games, his monotonous routine takes a thrilling turn. Unexpectedly, she even asks him out. From that moment on, they embark on a summer full of arcade escapades with a palpable sexual attraction simmering beneath the surface.
Momo, a high school student, is devastated by the sudden death of her best friend Sayo, who had been by her side since elementary school. Seeking solace, she reconnects with Sayo's younger brother Keichiro at the funeral, after eight long years of separation. Together, they revisit their favorite childhood spots - the secret base in the neighborhood, the twilight-drenched Ferris wheel, and the candy shop where they often hung out. They chase these memories in a bid to recapture the joy of their youth and search for the sights they had planned to share with Sayo during the summer that slipped away. As they go, they leave behind a bittersweet summer story, painted in blue by the hearts of the bereaved boys and girls.
The ecchi comedy manga centers on Kenta, who is instilled with sensual memories during the summer of his fifth year in elementary. Now a high school student, he ends up living with the person he has been fantasizing.
Chrono Alcon, a young demon, left his humble town and enrolled in a prestigious educational institution affiliated with the Demon King's Castle. He hoped to hide his rural background and remain unnoticed. However, his outstanding performance in the first exam caught the attention of his beautiful classmates and even the Demon King. Chrono realized that his dream of a peaceful campus life might be shattered in the underground chambers... along with his safety!
Once a regular teenager, Jinho Kang's life turned tragic when an accident rendered him paralyzed and alone. But in his new incarnation in medieval China, he rises as the Crimson Emperor, a feared master of demons who commands power over the land. Remarkably, Jinho retains his skills and abilities from his previous life, but he longs for the chance to live a normal life. Yet in the modern world, he encounters monstrous creatures terrorizing the populace. Realizing he alone possesses the power to stop them, Jinho embraces his fate as their sole savior.
Despite being a typical high school Japanese teacher, Reiji Hizuki is unexpectedly thrown into a perplexing situation when he takes on a temporary teaching job in a different town. The regular teacher he's replacing went missing two weeks before, and rumors suggest that Kyouichi Magaki, a troublesome student in her class, was spotted holding a knife with blood stains on the day of her disappearance. While the police pursue Magaki, the real question remains: what truly happened to Sakuraba-sensei? And what is Hizuki's connection to Magaki and the mystery surrounding her vanishing?
For over a decade, Yuuki and Natsuha have been close childhood friends, currently studying in their third year of high school. As they prepare to graduate, they face the possibility of attending different universities. Though they have recently started a romantic relationship, the shift from friendship to love can be difficult for anyone, especially them.
Haruhiko Sakai, an unassuming and typical background character, professes his love to the enigmatic and delicate beauty Yuki Shiraishi. Despite rejecting all previous suitors, Yuki ultimately accepts Haruhiko as a friend. However, this comes with the condition that he must accept every aspect of her, including her neet-ish otaku tendencies, like frequently skipping school and embracing her hyper-dere personality. It's now Haruhiko's responsibility to pass her tests in order to advance from being her friend to becoming her (otaku) boyfriend.
At only 15 years old, Kazuya Hasukawa is confronted with a difficult situation - the person he loves has fallen for his older brother, who has invited her to live with them. Kazuya is forced to leave his home and enroll in the all-boys Ryokuto Academy. However, his living conditions with a cross-dressing roommate prove to be less than ideal, despite the school's supposed reputation for excellence.